Mehome Mother's Day Kitchen Gift Rubber Silicone Drink Coasters (Set of 8 Pieces), Black Coasters Reversible Coaster is concave on both sides to contain liquid Set includes 8 pieces of black matte cup pads. Made of durable rubber silicone, this is a too elegant coaster.Dishwasher safe Coasters are 3 1/2" in diameter 100% Satisfaction Guarantee or your money back!